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Bicycle Information Tracking System: Hardware review

Bicycle Information Tracking System: Hardware review. Alex Wanamaker. BITS HARDWARE REVIEW. BITS HARDWARE REVIEW. BITS HARDWARE REVIEW: Blinker Circuit. 2 astable 555 timer circuits Blinking rate: ~1.1 seconds

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Bicycle Information Tracking System: Hardware review

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  1. Bicycle Information Tracking System:Hardware review Alex Wanamaker

  2. BITS HARDWARE REVIEW

  3. BITS HARDWARE REVIEW

  4. BITS HARDWARE REVIEW:Blinker Circuit • 2 astable 555 timer circuits • Blinking rate: ~1.1 seconds • Q1 and Q2 used to provide additional current for the circuit beyond the 555 timer’s limit of 200 mA • NXP SuperFlux LEDs: 110° viewing angle • LEDS require 70 mA min. • +3.3V supplied by GPIO P4 • Interface with U1 through 6-pin Molex connector • PCB Layout of final product

  5. BITS HARDWARE REVIEW:LPC2378 (U1) • NXP LPC2378 ARM7 Microcontroller • 32-Bit • 512 kB flash • 8 kB SRAM • 104 GPIO ports • 20 MHz crystal (X1) • Powered via +5V USB mini B connection (J3 and J4) • Produces +3.3V for ICs, GPIO, and external devices

  6. BITS HARDWARE REVIEW:USB Circuits • ETVS001 USB Port Protection (U2) • Provides protection for each line and between the supply voltage and ground for up to 25 A and 500 W within 8/20 μS. • NPC1117-3.3 (U3) • 18V max input, +3.3V output • Produces output current of 800 mA • USB mini B SMD connector (J4)

  7. BITS HARDWARE REVIEW:Battery Circuit • Nickel-Metal Hydride High Capacity Battery Pack (B1) • 9.6V, 2 Ah rechargeable battery pack with Tamiya connector J1 • 2-Pin Tamiya connectors (J1 and J2) • J2 interfaces with J1 to provide power to U4 • Power can be turned on/off by the user using SWI1 • LMZ14203 Switching Power Module (U4) • Takes 8 – 42V max, outputs +3.3V or 5V based on selection • 5-Pin USB mini B connector (J3) • Provides +5V to U1 to power the whole system

  8. BITS HARDWARE REVIEW:Touch Screen Controller (U5) • ADS7843 controller • 12-bit ADC with synchronous serial interface • Typical power dissipation: 750 μW • Includes a shutdown mode, with power dissipation at ~ 0.5 μW • Can operate on 2.7V

  9. BITS HARDWARE REVIEW:ELT240320TP Touchscreen (LCD1) • 2.8”, 240x320 RGB resolution • TFT touchscreen interface • Includes backlight control

  10. BITS HARDWARE REVIEW:Micro-SD and Hall Effect Device • Micro-SD (J5) • Surface mount Micro-SD Socket • Push in, Push out interface • Supports up to 4 GB storage • Interfaces with U1 to read from/write to an SD card • US1881 Hall Effect Device (U8) • Outputs 1 or 0 based on magnetic field • Used to calculate distance and speed

  11. BITS HARDWARE REVIEW:GPIO GPIO ports: • P4 (J7) • Interfaces with turn signal switches to display on-screen indicator • IO9 and IO11 detect switch voltage for left and right switches, respectively • IO10 and 12 output voltage to turn signal • P3 (J8) • Powers U8, counts pulses from U8 on IO1 for calculations

  12. BITS HARDWARE REVIEW:Connections • 12-pin Molex • Used to connect U1, U8, SW1, SW2, J7, and J8 with the turn signal via J6 • Both J9 and J6 will be detachable from the bicycle • J10 and J11 will remain on the frame of the bicycle

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